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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[SERVER-31704] Periodic drops in throughput during checkpoints while waiting on schema lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-31704</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Periodic drops in throughput can be observed during checkpoints while running with an artificial workload and specific WiredTiger tuning parameters enabled.&lt;/p&gt;

&lt;p&gt;I&apos;ve attached &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/169158/169158_diagnostic.tar.gz&quot; title=&quot;diagnostic.tar.gz attached to SERVER-31704&quot;&gt;diagnostic.tar.gz&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt; that shows this behavior. At around &lt;tt&gt;2017-10-20T20:10:08.587Z&lt;/tt&gt; the following command was executed:&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.adminCommand({setParameter: 1, wiredTigerEngineRuntimeConfig:&quot;file_manager=(close_handle_minimum=100,close_idle_time=300,close_scan_interval=30)&quot;});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;After reaching steady state, we see the following:&lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/169157/169157_periodic_drops.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;Additionally, from perf, we can see that after making this parameter change, a single cpu core (12.5% of the total) is consistently fully utilized running eviction: &lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;__wt_thread_run+0xffff5458d1e2e016&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;__wt_evict_thread_run+0xffff5458d1e2e951&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="450168">SERVER-31704</key>
            <summary>Periodic drops in throughput during checkpoints while waiting on schema lock</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="brian.lane@mongodb.com">Brian Lane</assignee>
                                    <reporter username="kelsey.schubert@mongodb.com">Kelsey Schubert</reporter>
                        <labels>
                            <label>customer-mgmt</label>
                    </labels>
                <created>Tue, 24 Oct 2017 19:06:18 +0000</created>
                <updated>Thu, 17 Aug 2023 15:08:38 +0000</updated>
                            <resolved>Fri, 24 Sep 2021 02:16:20 +0000</resolved>
                                    <version>3.4.9</version>
                                    <fixVersion>4.3 Desired</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>13</votes>
                                    <watches>42</watches>
                                                                                                                <comments>
                            <comment id="3341306" author="milkie" created="Sat, 15 Aug 2020 13:44:11 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-6421&quot; title=&quot;Avoid parsing metadata checkpoint for clean files&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-6421&quot;&gt;&lt;del&gt;WT-6421&lt;/del&gt;&lt;/a&gt; was not backported to 4.2 yet.  The fixVersion numbers on the ticket that do not have &quot;WT&quot; in them represent the MongoDB releases that contain the ticket work.&lt;/p&gt;</comment>
                            <comment id="3340591" author="JIRAUSER1269871" created="Fri, 14 Aug 2020 21:15:11 +0000"  >&lt;p&gt;Will&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-6421&quot; title=&quot;Avoid parsing metadata checkpoint for clean files&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-6421&quot;&gt;&lt;del&gt;WT-6421&lt;/del&gt;&lt;/a&gt; be implemented as a partial resolution to this? What versions can we expect it to be in? I saw it was backported to 4.2 and possibly 4.0, but don&apos;t see where that maps into a specific release version of 4.2 or 4.0&lt;/p&gt;</comment>
                            <comment id="3209345" author="ralf.strobel" created="Tue, 16 Jun 2020 04:59:44 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-5479&quot; title=&quot;Checkpoint schema lock can cause long stalls in command execution on systems with many active data handles&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-5479&quot;&gt;&lt;del&gt;WT-5479&lt;/del&gt;&lt;/a&gt; which I created after our own debugging may essentially be a duplicate of this issue and contains some more depictions and benchmarks by affected users. &lt;/p&gt;</comment>
                            <comment id="3203390" author="apang@netskope.com" created="Wed, 10 Jun 2020 15:58:29 +0000"  >&lt;p&gt;I don&apos;t see the in question macro listed here. Here are our patches:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/apang-ns/mongo/commit/1aea123a49f6eed873694a8d5dd9a46f903a3dde&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/apang-ns/mongo/commit/1aea123a49f6eed873694a8d5dd9a46f903a3dde&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/apang-ns/mongo/commit/b23b9b1a0a079e9835a3e16a91ddaaaaacc83014&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/apang-ns/mongo/commit/b23b9b1a0a079e9835a3e16a91ddaaaaacc83014&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Percona has a better version of this patch they included in their 3.6 release train if you&apos;re looking to experiment: &lt;a href=&quot;https://www.percona.com/doc/percona-server-for-mongodb/3.6/release_notes/3.6.18-6.0.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.percona.com/doc/percona-server-for-mongodb/3.6/release_notes/3.6.18-6.0.html&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;As mentioned in this thread,&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-5042&quot; title=&quot;Reduce configuration parsing overhead from checkpoints&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-5042&quot;&gt;&lt;del&gt;WT-5042&lt;/del&gt;&lt;/a&gt;&#160;makes reading/writing checkpoint metadata faster in 3.6.17+, so you&apos;d see improvement even if you did not increase the hash array sizes with the config that is introduced (i.e. big_hash_array_size,&#160;session_dhhash_size).&lt;/p&gt;</comment>
                            <comment id="3200072" author="falmiski@creativeradicals.com" created="Tue, 9 Jun 2020 20:51:31 +0000"  >&lt;p&gt;So which of these options did you tweak Andy?&#160;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://source.wiredtiger.com/mongodb-3.4/group__wt.html#ga8ca567b2908997280e4f0a20b80b358b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://source.wiredtiger.com/mongodb-3.4/group__wt.html#ga8ca567b2908997280e4f0a20b80b358b&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;I&apos;d like to give that a try. I&apos;m seeing issues that I believe are related to dhandle as well.&#160;&lt;/p&gt;</comment>
                            <comment id="3197000" author="apang@netskope.com" created="Tue, 9 Jun 2020 13:37:46 +0000"  >&lt;p&gt;For high data handle count workloads, we&apos;ve found that WT spends 50% of checkpoint prepare time traversing dhandles, and during this time requests from app threads are not serviced.&lt;/p&gt;

&lt;p&gt;Our fix was to increase the hash array size for dhandle (currently hardcoded to in WT 512 buckets) for more efficient lookup. We were able to improve performance by 50%+ during checkpoint prepare (the time when the schema lock is held) by eliminating the traversal time using the existing hash mechanism.&lt;/p&gt;</comment>
                            <comment id="2993650" author="brian.lane" created="Tue, 24 Mar 2020 05:51:38 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=falmiski%40creativeradicals.com&quot; class=&quot;user-hover&quot; rel=&quot;falmiski@creativeradicals.com&quot;&gt;falmiski@creativeradicals.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;There currently isn&apos;t an ETA for this one - I had wanted to spend some time digging into it before the upcoming 4.4 release, but I expect it will need to wait until after that release is finished.  Could you give me more details on which version you are using and the issue you are experiencing? &lt;/p&gt;</comment>
                            <comment id="2992749" author="falmiski@creativeradicals.com" created="Mon, 23 Mar 2020 19:19:39 +0000"  >&lt;p&gt;Requesting update, once again&lt;/p&gt;</comment>
                            <comment id="2985892" author="falmiski@creativeradicals.com" created="Wed, 18 Mar 2020 20:26:12 +0000"  >&lt;p&gt;ETA of this fix? Please bump the priority if at all possible...&lt;/p&gt;</comment>
                            <comment id="2881644" author="brian.lane" created="Tue, 18 Feb 2020 05:30:08 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dmitry.agranat&quot; class=&quot;user-hover&quot; rel=&quot;dmitry.agranat&quot;&gt;dmitry.agranat&lt;/a&gt; could you perhaps re-run this with a version that has &lt;a href=&quot;https://jira.mongodb.org/browse/WT-5042&quot; title=&quot;Reduce configuration parsing overhead from checkpoints&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-5042&quot;&gt;&lt;del&gt;WT-5042&lt;/del&gt;&lt;/a&gt; included.  We have seen up to 50% improvement in some cases for lock duration.  Wonder if we can resolve this one now.&lt;/p&gt;</comment>
                            <comment id="1714269" author="thomas.schubert" created="Wed, 1 Nov 2017 07:27:20 +0000"  >&lt;p&gt;I don&apos;t believe this is new as I see similar behavior in MongoDB 3.4.4. Unfortunately, given the nature of the workload, I wasn&apos;t able to determine whether 3.4.0 is similarly affected.&lt;/p&gt;</comment>
                            <comment id="1708084" author="alexander.gorrod" created="Tue, 24 Oct 2017 22:57:56 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anonymous.user&quot; class=&quot;user-hover&quot; rel=&quot;anonymous.user&quot;&gt;anonymous.user&lt;/a&gt; Do you know if this symptom is new, or if it was present in previous releases of MongoDB?&lt;/p&gt;</comment>
                            <comment id="1707757" author="thomas.schubert" created="Tue, 24 Oct 2017 19:08:24 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alex.komyagin&quot; class=&quot;user-hover&quot; rel=&quot;alex.komyagin&quot;&gt;alex.komyagin&lt;/a&gt; encountered this issue during some testing around tuning workloads with many collections.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="1113615">WT-5479</issuekey>
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                                        <issuelink>
            <issuekey id="487229">SERVER-32890</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1380238">WT-6421</issuekey>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="743365">SERVER-40773</issuekey>
        </issuelink>
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                            <attachment id="265370" name="checkpoint_lock_4.2.7.png" size="180078" author="dmitry.agranat@mongodb.com" created="Tue, 9 Jun 2020 12:59:49 +0000"/>
                            <attachment id="169158" name="diagnostic.tar.gz" size="73151033" author="kelsey.schubert@mongodb.com" created="Tue, 24 Oct 2017 18:55:23 +0000"/>
                            <attachment id="169159" name="mix.js" size="6535" author="kelsey.schubert@mongodb.com" created="Tue, 24 Oct 2017 18:41:03 +0000"/>
                            <attachment id="248697" name="no_checkpoint.png" size="213593" author="dmitry.agranat@mongodb.com" created="Mon, 24 Feb 2020 12:32:44 +0000"/>
                            <attachment id="169157" name="periodic_drops.png" size="346666" author="kelsey.schubert@mongodb.com" created="Tue, 24 Oct 2017 18:56:40 +0000"/>
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                            <customfieldvalue>&lt;p&gt;Run &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/169159/169159_mix.js&quot; title=&quot;mix.js attached to SERVER-31704&quot;&gt;mix.js&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;&lt;br/&gt;
Set the following parameter:&lt;/p&gt;
&lt;p/&gt;
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